An electron of kinetic energy`E_(0)` is scattered by an atomic hydrogen sample in ground state. Find the minimum value of `E_(0)

An electron of kinetic energy`E_(0)` is scattered by an atomic hydrogen sample in ground state. Find the minimum value of `E_(0)`,so that a photon of wavelength `656.3`nm may be emitted by H-atom.
A. `12.09 eV`
B. 13.6 eV`
C. `14.6 eV`
D. None of these

An electron of kinetic energy`E_(0)` is scattered by an atomic hydrogen sample in ground state. Find the minimum value of `E_(0)`,so that a photon of

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